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X is a three-digit positive integer in which each digit is e

Expert replies
by BTGmoderatorDC » Tue Feb 05, 2019 4:40 am

Timer

00:00

Answers

A

B

C

D

E

Stats

Difficulty

X is a three-digit positive integer in which each digit is either 1 or 2. Y has the same digits as X, but in reverse order. What is the remainder when X is divided by 3?

(1) The hundreds digit of XY is 6.
(2) The tens digit of XY is 4.

OA A

Source: Manhattan Prep
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Source: — Data Sufficiency |

by Jay@ManhattanReview » Wed Feb 06, 2019 1:51 am
BTGmoderatorDC wrote:X is a three-digit positive integer in which each digit is either 1 or 2. Y has the same digits as X, but in reverse order. What is the remainder when X is divided by 3?

(1) The hundreds digit of XY is 6.
(2) The tens digit of XY is 4.

OA A

Source: Manhattan Prep
This can be solved efficiently with some hit and trial approach.

Let's take each statement one by one.

(1) The hundreds digit of XY is 6.

Given that the hundreds digit of XY is 6, we can have two cases: 1. (X, Y):(121, 121) and 2. (X, Y):(112, 112). In each case, the remainder when X is divided by 3 is 1. Sufficient.

(2) The tens digit of XY is 4.

Given that the tens digit of XY is 4, we can have two cases: 1. (X, Y):(121, 121) and 2. (X, Y):(212, 212). In the first case, the remainder when X is divided by 3 is 1, while in the second case, the remainder when X is divided by 3 is 2.

No unique answer. Insufficient.

The correct answer: A

Hope this helps!

-Jay
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by Jay@ManhattanReview » Wed Feb 06, 2019 1:51 am
BTGmoderatorDC wrote:X is a three-digit positive integer in which each digit is either 1 or 2. Y has the same digits as X, but in reverse order. What is the remainder when X is divided by 3?

(1) The hundreds digit of XY is 6.
(2) The tens digit of XY is 4.

OA A

Source: Manhattan Prep
This can be solved efficiently with some hit and trial approach.

Let's take each statement one by one.

(1) The hundreds digit of XY is 6.

Given that the hundreds digit of XY is 6, we can have two cases: 1. (X, Y):(121, 121) and 2. (X, Y):(112, 112). In each case, the remainder when X is divided by 3 is 1. Sufficient.

(2) The tens digit of XY is 4.

Given that the tens digit of XY is 4, we can have two cases: 1. (X, Y):(121, 121) and 2. (X, Y):(212, 212). In the first case, the remainder when X is divided by 3 is 1, while in the second case, the remainder when X is divided by 3 is 2.

No unique answer. Insufficient.

The correct answer: A

Hope this helps!

-Jay
_________________
Manhattan Review GMAT Prep

Locations: GMAT Classes Austin | GMAT Tutoring Denver | GRE Prep Los Angeles | TOEFL Prep Classes Las Vegas | and many more...

Schedule your free consultation with an experienced GMAT Prep Advisor! Click here.
Join the discussion